—I really like eating potato chips.Do you know ________they were invented? —Actually,they were inven...
2022-07-01 21:43:22 48次 安徽省阜阳市2019-2020学年九年级下学期3月月考英语试卷 单选题 反馈错误 加入收藏 正确率 : 100%
题目内容：
—I really like eating potato chips.Do you know ________they were invented?
—Actually,they were invented by mistake.
A.why B.when C.how D.whether
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